JCS JMJ unidentified large school badge (1950's or earlier)

Postage is extra:

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For sale is what I believe to be a school badge but was unable to identify it. If any knows the identity or which school is represented by this badge, I'd be grateful to hear from you.

The letters J.M.J. may stand for Jesus, Mary and Joseph and there is a motto 'Faithful Courteous & True'. This is a relatively large enamelled badge.

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DESCRIPTION:
Size: About 1 1/32" x 1 1/2" (26mm x 38mm).
Material(s): Brass metal with 2 vitreous enamels.
Finish: Tin plated.
Fitting: Pin.
Imprint: None.
Approximate age: 1920's to 1950's.

CONDITION:
Excellent condition. No damage. Pin in good working order. Tiny bit of wear to the tin plating on the cross.
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