Printer’s mark?

I was given a tin box of mostly nib pens and old bits and pieces of things from mid 1800’s to 1920’s or so.
In one box I found a stack of Gillette razor blades in their original packaging along with a type high block with a photo plate that looks suspiciously like the face on the razor packaging. The packaging appears to be from 1924-25.
There is a stamped mark on the side of the block. 144 and the letters J.P.EO (maybe U) inside a decorative shape.
I thought the initials might be for the place that made the block….
It’s not really a pressing matter, but I’m curious about the origins of things.
Anyway, any help would be appreciated.

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Amanda, Humble ramblings from the U. K.
Well done for posting Your newly acquired L/press >treasure< on B. P. and sharing.
Pure coincidence but few days ago was fortunate in acquiring a collection of Printing Plates, Cuts, Blocks etc., (We use slightly different terminology maybe)
More than 100 individual pieces, some mounted and used, some unmounted and never pressed into service, but in essence a fantastic cross section of Letterpress artefacts. illustrating the progression and Time Line of Plate technology.
The entire collection was centered around a Hardware store, (unfortunately no Razor orientated items) but still a Good cross section, but interesting, in that every Plate, Cut, etc., had an *In House* reference number and according to which Mounting base was used, technical details of the plates involved, i.e. Zincos, Electros, Stereos, 1/2 Tones, Process etched, (copper) perhaps synonymous with Your 144,? description.
When You are able to post shot(s) of Your treasure, I will do my best to identify and cross reference against My acquisition(s)
Apologies if My crude terminology (above) is inaccurate.
Always happy to be corrected.!

Thank You and good luck. Mick U.K.

Gillete razor blades were the basis for tiny current transformers as used in the secret radio sets in RAF POW camps in Germany in WW2, as taught to a few RAF aircrew on the co called ‘special signals courses’ run by MI9. By
war’s end many camps had transmitters too. And printing sections producing maps in up to six colours by lithography
and much else besides. Fake offical stamps etc. Dont ask me where they got the chemicals from, its a delicate matter! In passing, Balding & Mansell at Wisbech in the Fens printed the silk escape maps used by the USAF in the Vietnam War.

The mark on the side probably is an IPEU photoengravers union bug, with number identifying the shop that produced the cut.