The listing, Merona Watch has ended.
25-27cm in circumference.
Back is made in stainless steel
Incase you can read the pic, the back says:
"base metal bezel 1012. Merona FMDM120 52 Battery 377 Japan Movt FMD
Stainless Steel Back"
Ive had it for about 3 months but never wore it because it doesnt fit my wrist.
As of now, the battery still works.