Well, I just spend the last few hours with ChatGPT and my ~135 coin Type set. I'm very pleased with the results. It found a few small errors in my type year ranges, suggested some new coin slots, added diameter, weight, edge type, to all my Type slots, among other things. Works remarkably well. Basically anyone with an excel spreadsheet for their coin collection that wants some insight, and doesn't mind sharing the coin details, it would be well worth you time to upload it. Even if just for catching errors. I also found the insight into my collection interesting, which is why I am sharing it here. I know one or two of you with think this is cool. this is some of what it had to say: 1. The strongest pattern is grade versus age Your collection isn't pursuing a uniform minimum grade. Instead, the grade rises almost continuously as the coins become younger and more available: Coin date......Owned.....Median numeric grade Before 1800.........4.........3.5 1800–1849.........23.........30 1850–1899.........40.........51.5 1900–1949.........33.........64 1950–1999.........22.........66 2000-present........9.........69 That's a remarkably clean progression. It tells me you're essentially practicing era-adjusted condition collecting: early coins are allowed to be heavily circulated because simply owning an attractive, problem-free example is the accomplishment; by the 20th century, your standard naturally rises to Choice/Gem Mint State; modern representatives are essentially superb-grade pieces. That's quite different from registry-set optimization, where grade points and weighting explicitly drive rankings. 2. Your date choices aren't simply “buy the cheapest common date” This was the part I found most interesting. Among representatives whose type has a finite multi-year range: 23 are the first year of their type 23 are the last year 62 are somewhere inside the type's run another 18 represent single-year types So roughly 35% of your applicable representatives are boundary-year coins—either the introduction or final year of the design/type. That makes the collection more historically expressive than one assembled solely by asking, “What's the cheapest date for this type?” PCGS's traditional description of type collecting specifically says collectors commonly identify the more common dates and buy the nicest examples they can afford. Your choices frequently depart from that simple model. 3. Your mint mark distribution is: Mint.......Coins Philadelphia/no mintmark*.......90 San Francisco.......18 Denver.......13 New Orleans.......7 West Point 2 Carson City 1 Manila 1 *For these purposes I'm treating blank as predominantly Philadelphia, while recognizing that the colonial/token/medal material isn't literally Philadelphia Mint production. So yes, the collection is overwhelmingly Philadelphia. But your 19th-century branch-mint coins are disproportionately interesting. You have O-mint Seated material across several denominations, including the 1838-O No Stars dime, 1840-O No Drapery dime and half dime, 1840-O No Drapery quarter and 1860-O Seated dollar. And there's a CC representative—the 1877-CC Seated quarter. So you haven't pursued mint diversity for its own sake. Rather, branch mints appear where they make the individual type representative more interesting. 4. PCGS dominates, but NGC is substantial You own: 102 PCGS (77.3%) 30 NGC (22.7%) That's about 3.4 PCGS coins for every NGC coin. I wouldn't interpret that as a judgment about the services. It simply tells us that over years of hand-selecting coins, your collection has naturally become heavily PCGS-oriented. 5. Your remaining holes are now extremely concentrated This is perhaps the best measure of how mature the collection has become. You currently have 132 filled slots out of 141 = 93.6% complete. And only 9 NEED slots remain: Draped Bust Heraldic Eagle Dime 1807–08 Original Design Capped Bust Half Liberty Head $2.50 1903–04 large 10 Centavos 1903–05 large 20 Centavos 1907–29 reduced 20 Centavos 1903–05 large 50 Centavos 1903–06 large Peso Lafayette Dollar What's striking is their concentration. Five of the nine are U.S.-Philippines. So your mainstream U.S. type collection is actually much closer to completion than the raw 93.6% figure suggests. The recent decision to split the Philippines denominations by physical type created a large portion of the remaining holes. 6. What I think the collection says about you as a collector After looking at the actual coins rather than just the slot definitions, I'd characterize it as a historically oriented advanced type collection with condition expectations scaled to availability. You aren't chasing registry points. You aren't imposing an arbitrary grade floor. You aren't simply buying the cheapest date that satisfies each slot. And you're not using Proofs to make difficult circulation types easier. Instead, the pattern is roughly: Early rarity → accept honest circulation. 19th century → seek increasingly strong circulated/low-MS examples. 20th century → generally Mint State. Modern → extremely high grade. At the same time, you seem to have a noticeable attraction to transition points—first/last years, short-lived designs, physical changes, unusual denominations and significant subtypes. That matches what we've seen when deciding which rows deserve separate slots. PCGS notes that type collecting doesn't have one universally correct definition and can be expanded into more technical differences according to the collector's interests; your set is very much in that latter category. Example question I asked at the end of the analysis: Filling in the diameter and weight and metal composition for each coin I own was worth the price of admission alone, however it did all suggest some edits / fixes. An example corrections it found for me: Liberty Head Nickel, With CENTS — 1883–1913 should be 1883–1912. The famous 1913 Liberty nickels were not a normal circulation issue, so 1913 shouldn't define the range of your business-strike type. Also, your Silver Eagle Type 2 Eagle Landing row says 2023–Present, but your own representative coin is a 2021-W. The redesign actually began during 2021, with both Type 1 and Type 2 produced that year. The Mint specifically says the new reverse began appearing in mid-2021. That one is an unambiguous correction to 2021–Present. It talked to me A ALOT about my set, and probably could keep doing so. I am just sharing some key points here on CT. I just wanted to give you AI-skeptics a little real world example of how this coin help your hobby. TLDR: AI doesn't need to be so pie-in-the-sky or an all encompassing menace, it can just be like a handy and polite secretary that tells you when you've made a mistake that you would otherwise not notice.
