To determine the VRAM from looking at the card we need to know the part number of the memory chips and the number of them on the board. It's hard to make out the part numbers from the photos.

Can you read the part number off of the sixteen identical memory chips, and also off the VRAM SIMMs. check the back of the board to make certain there aren't more memory chips hiding there.

I'm not sure but from what little I can make out, it looks like 768KB of VRAM, with a little guessing serving where knowledge is unavailable.