A unusual vintage ST. PETER medallion (pre-1950s)

Postage is extra.

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For sale is this large (59mm height) and unusual medallion showing St. Peter on the reverse side. He is shown holding the Keys to the Kingdom of Heaven and in his left hand a scroll, likely representing the Holy Scriptures. The obverse side shows a four-letter monogram (PCSM?) which may represent a religious confraternity. Anyone recognise this monogram?

The image of St. Peter is struck in a high relief, giving the image an almost 3-D like quality.

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DESCRIPTION:
Size (excluding the bale): 2 5/16" height x 1 13/16" width (59mm c 42mm).
Material(s): a pewter-like tin based alloy.
Finish: appears to be a tin wash?
Fitting: bale to take a suspension ring.
Imprint: none.
Approximate age: pre-1950s but likely 1930s or earlier?

CONDITION:
Very good condition. No damage. St. Peter's nose is partially flattened. Wear of tin wash on both sides but much lustre remaining.
Please see photograph(s), these form part of the description.

POSTAGE:
* Postal costs are extra, additional to the Asking Price
* I always get a proof-of-posting certificate.
* I combine postal costs for multiple items when these are paid for and posted the same time.

RETURNS:
* Return accepted if the item(s) is returned in same condition it left me, then the full Agreed Asking Price will be refunded. Postal costs are not refundable.
* Buyer pays the return postal costs - unless agreed otherwise.

B.40