Mystery Cassette

I got an unknown 10-speed 11-25 road cassette thrown in with a pair of wheels I bought and was wondering if anyone can tell me how to identify it? The seller didn't have a scooby (the downside of getting such a bargain
)
It has a Sram lockring, but black plastic spacers with "10s" markings that seem to be Shimano. It weighs about 230g. There don't seem to be any branding marks, just reference identifiers on the cogs e.g. "J1".
Luddite that I am, I haven't sorted how to post pics on here, just wondering if anyone can point me in the direction of how to identify it myself.
Ta

It has a Sram lockring, but black plastic spacers with "10s" markings that seem to be Shimano. It weighs about 230g. There don't seem to be any branding marks, just reference identifiers on the cogs e.g. "J1".
Luddite that I am, I haven't sorted how to post pics on here, just wondering if anyone can point me in the direction of how to identify it myself.
Ta
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Parktools :?:SheldonBrown