Agreed, although the generators can generally be fixed: but the regulator which was a "bitch". The one on my '53 G9 failed and was deemed un-repairable. This example would be a 500cc I suggest as you can see the generator strap on the front of the crankcase. The 600cc (G11 in Matchless terminology) and 650cc (G12), as far as I am aware, both had alternators. (Well my '60 model G12 did anyway.) Oil leaks: Yes, even with the cast primary case they could still leak. I put mine over a surface plate and "gooped" the gasket but it was never totally oil-tight. Still a lot better than the pressed steel variety though. I forgot to count the fins but I will get back to you.The more likely scenario is that usually the dynamo fails and is not repaired (expensive) , then the bike is run on a "total loss" electrical system, the battery goes flat , no electrics and the battery is taken off the bike to re charge before riding again.
Easy way to tell cc's is count the fins on the barrel , 6 fins = 500cc twin , 7 fins = 650 twin. My eyesight doesn't let me count the fins on this one.
1953 could be spot on, they stopped fitting "jampot" shocks in 1957 (the pix has jampots), wide front wheel hubs came in 1954 (narrow front hub), and the Burman gearbox pictured came into use in 1952, so a 1952-53 model. Of course over the years could have been a mix of whatever part fitted or were available.
As for the oil leaks, that looks about less than a days worth !
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