To be honest I have no idea what the cranks are, I am sure they are either an old shimano LX or FSA Spider, I will take a look and see if there is any markings.
On that subject I could put a newer Shimano XT Chainset, Deore front shifter and fit the XT front mech, so its a full working bike again, I would do this for an extra £50 on the asking price.
Cheers
Gareth