Got this a few weeks ago and posted a few pics. Kim bought me the FWB 124 as a birthday present. Two days later a member here who knew I was looking for a MK1 HW77 let me know there was one on the giant auction site. There were actually two. One I considered offering the guy $25 and a ham sammich for if he paid shipping. This one became my bday present to myself. Very early version. Number 839, made in 1983 according to HW database. 25 mm piston of course. Doesn’t have the nut to hold the trigger block to receiver they switched to later, long front stock screw does that instead. Beautiful condition cosmetically. Haven’t shot it much or talked about it because in the first 5 shots it started dieseling heavily. Wiped what I could, kept getting worse, shelved it till I had time. Took it apart yesterday and stripped all the lube, re-lubed with ARH moly and a little ARH clear tar on sliding compression tube. Already had brand new Vortek piston seal. Much better, feels like it should now. Putting out about 10.5 FPE at present. Needs a new breech seal and I didn’t have one handy, assuming it will go to 12’ish when replaced. These old 77’s are timeless IMO. One of the guns that will be in my estate sale.