This is the 50th year of issue for the Lincoln cent, and the last year of the wheat reverse. The design was introduced on the centennial of his birth, it would be replaced with the Lincoln memorial in 1959 in honor of the 150th anniversary, and with a series of four new reverse patterns in 2009 for the 200th anniversary. By this time a number of stylistic changes had occurred along the way. The numeral 5, for instance, changed from a small rounded format to a long-tailed version. The date is bigger overall. The carefully sculpted beard and hair had long since worn off the master hubs. The proof-like rims of this 1915 also gave way to narrower ones. 1958 Proof 1958 Business strikes
I find most of mine at a store that buys gold, silver, coins and paper money. I stop about 2 times a week. I buy all they have that day. Might be 100 to 1000 or more. If they buy books, they will pull out an 09S or 14D. They just don't take the time to look for key dates otherwise.
The one BIG advantage he has over the rest of us, is he get's to shoot the coins naked. He have to shoot them through the plastic limiting our lighting options significantly. I liked your idea of placing a piece of black poster board with a hole over it to help eliminate the distracting glare. I was thinking down those lines last night with my 1909 I posted. I think I may try that this evening.
Here's a quick and dirty comparison for you. Parameters for both: Schneider Componon-S 50mm, ISO 200, f/5.6 (forcing minimal DoF to "disappear" the plastic), Aperture Priority, -0.3 Exposure Compensation. Both shot RAW, used the non-shielded shot to regularize White Balance via slab appearance and carried that setting over to the other, Sharpness +3 in RAW processing. Cropped and background-filled in the Gimp to hide the surroundings, reduced to 50% size and posted here. I moved nothing after settling on how I was going to light both, except to add the shield. Which one was shot with the shield in place? Don't cheat and read the Exif for exposures.
The top one was with the shield and the bottom one was without the shield. The contrast around the rim moving in is much better on the top one. I didn't cheat either.
It's a subtle difference, but plain nonetheless. You're right, of course. Caveat: I need to trim the shield to fit within the slab (it's not right now) so it'll fit flatter around the coin. It was tough to get a Nickel-sized hole around a Cent in a fashion that didn't block the light when it was sitting on the spacing ridge of the slab. I'm not shooting another slab unshielded again.
1959 introduced the Lincoln Memorial reverse. This is where having duplicates comes in handy. One proof is in the original packaging. For display, I removed the black foam surround from a Lighthouse 2x2 holder. The plastic just fits in there nicely. I show this one with the reverse up in my display tray, and the second one with the obverse up. To its left I have my extra 1957 proof with the reverse up, so the wheat and memorial reverses are side-by-side. It chronicles the change in design at the same time it shows how they were sent from the mint. Here is how that looks. The second proof was part of the album I bought and was kind of spotted. When I rinsed it in acetone and xylene that come off and revealed this toning and cameo effect. That was a pleasant surprise! (A still photo is attached below.) 1959 Proofs 1959 Business strikes