......From the measurements online it appears the L1 is more or less as large as my Mk 7S, which is almost as big as my M5, are they correct?........
I didn’t take any measurements, I just lined up my L1 and 7 and compared bodies. The top plate of the L1 is substantially lower than that of the 7. The width of the L1 is less than the 7, mainly because of the viewfinder “bulge” on the 7 (quite obvious when looking straight down at both cameras). Both cameras appear to be identical when it comes to length.
When held in your hands, the overall mass of the L1 seems to be a lot less than that of the 7 (or 7s).
And I didn’t catch that your L1 had a self timer. Very interesting. Photomoof is right, whatever material used for the shutter curtains will tell you a lot, as well as the color of your viewfinder optics (gold or silver).
I see you serial number is 558706, which puts it right on the edge between L1 production and VL production. You may very well have a hybrid camera.
As for haze on the 50/1.8, like any lens that is 50+ years old, internal haze is a possibility. To my knowledge, it doesn’t have the haze characteristics of the 50/1.2, which will reoccur, no matter how many times you clean the lens (luckily, an easy fix, can take part my 50/1.2 and clean in about ten minutes).
Jim B.