THAT is a mighty-fine commemorative! I’ll jump out in the deep end and say it is a Proof 65. Super surface. Super luster. Super strike.
Well…… I have seen that background before. Happens to be the background that a popular EBay seller uses. The same seller has a tendency to juice up his photos and/or do a little polishing as well….. Be wary. All may not be as it appears.
The experts (Anthoney Swiatek) do not think any Proofs of this coin exist. I have seen examples of this coin with very bright surfaces. That is not unusual. Here's mine, which is graded MS-64. Here's another one I won for a FUN exhibit.
After comparing to yours and researching, this one does look to be polished. Neither NGC nor PCGS list a proof for a 1925-S California (Diamond Jubilee). The OP pic shows what looks to be squared rims like proofs have.
I also immediately recognized the old-timey check background as a rather notorious seller. As I recall, they crack out details coins and juice up their images.
Welcome again - the photos are showing up this time! As others have said, these images look like a spectacular coin, except not quite right. If they're from an eBay seller known to juice up images, it's likely that this coin too will turn out to be polished, greatly reducing its value. If this is a coin you've bought and you've posted the eBay images while you're waiting for delivery, then examine it very carefully when you get it, and post your own photos here. If you like it at the price you paid, great, but if you don't, be ready to request a return. Actually, after digging around a bit... I see denver.coins has this as a currently active listing, ending in two days. I also see that they sold several other examples of this coin recently, including two on April 13 and 27 with remarkably similar images, each for $330. (Not images of the exact same coin, though, I think; I see different hits on each one.) Now I wonder even more intensely exactly what's going on with this seller and item.
I've seen this seller on many threads across forums in the past, and it's always the same thing. I would only buy a coin slabbed by a reputable TPG from them, and even then look for other photos on the TPG websites.