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Help dating these plates.

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tcolgate

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Would anyone have any ideas on a date for these, or maybe a way of dating them? There's no expiry on the packaging. I think the label style is later. I'm assuming '60s or '70s. I'm not sure when they stopped making p300, or coating glass. The data sheet includes recipes for D61a, D-190, D-167, and F-53 and F54a fixers. They may have been packaged (or manufactured?) In London.
I have 3 boxes. The emulsion is surprisingly fine for a fast film. They are very fogged, but I'm still getting some fun results.
I can't find any old product catalogues with plates listed (I'm sure I did find one a few months back). Looking a various museum items with the similar styling, early 1960s seems likliest.
 

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