Thanks Mike, that's really helping to narrow it down now...looking like it's most probably another 702...sigh!
Despite the disgusting humidity, I did make some progress cleaning up the reel mower. I managed to suffer through steam cleaning it today, and discovered that nothing was frozen, and all bearings seem nice and tight. Brought it home and gave everything a quick oil bath, seems like all will be good to go for a quick test run tomorrow, once it's all put back together and mounted up. I also noted the drive pulley has a small gear box with a fluid fill port on the side. I'd like to change the fluids, anyone know what type, and how much is uses? Just fill the box to the bottom of the fill plug?