Chinese 12.7x108 Type 54-1 APDS

I can’t find much info online about the Chinese 12.7 APDS load, and I have a cartridge that I suspect to be this type. My primary question is how rare are they to find, and what would the value be? The headstamp is: 41 85. Below are photos of what I have:

Hello Matt, here is the projectile sectional



Think I paid about $75 for mine perhaps 15 years ago?
They were fresh into the country then. No idea how many came in.

Thanks guys! Good info and pics.

There is also one in 14.5x114.

Also there is a newer design of the 12.7 which looks much like the US Olin made designs.