What is it? Marking s.p.m.c ironstone behind the plate

[Supriya]

 

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[Supriya]

 

[Supriya]

 

[SD51]

This company can probably help you. Can't seem to find what S.P.M.C. stands for but it is a company in Japan.

https://www.replacements.com/china-spmc-japan/b/001-14370511

 

[Supriya]

Thank you sir for your link info