G261C = PE2950 board generation?

Hi,

I'm looking to buy a PE2950 board but I can only reference it via its part number (no chassis) and the board cannot be installed and fired up. The code on the board ends in G261C but I cannot seem to find any relation to the generation on the docs.

Can anyone tell me what generation does the G261C part belong to please? or possibly a some pointers to where I can find this information. .

So far my search has yielded the following:

Gen 3: X999R, MX368, H268G, H603H, J250G, M332H, DP246, G639G

Gen 2: CU542, NR282, JR815, DT021

Gen 1: NH278, PR278, CW954

Thanks!