I'm not really engaging you in a dispute here so please no offense.
I am just relaying my experience, which includes using the camera, having issues....and attempting to solve through personal and direct telephone discussions with Don and Sherry. they understood exactly what I was talking about.
I never said the M5 had 28 mm frames lines...it has 35, 50, 90, 135. the 50 also has a spotmeter indicator outlines. A very useful feature in my opinion. However, when the viewfinder degenerates and many do, the replacement is an M6 finder which has 28mm frames lines which you cannot see. It loses the spotmeter lines. Those with an M5 and this problem should decided for themselves how they wish to proceed.
Meters and cells of this age respond differently. If yours works with a 1.5v silver oxide battery. Great. Most will not. the adaptors, one of which I use in my CL....and my Canon QL 17III is fantastic....but no go in the M5. Repairmen will adjust voltage if owner wishes.
I like your photos....thanks