25 Pounder info needed.

[Private_collector]

Another quality piece arrived today.
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A very nice 25pdr Tool Box, that hasn't seen much work, if any, in it's long history. All the screws undo without any coercion at all. The canvas is in very good shape. At some point the two wooden blocks on the lid will be removed, and I will carefully lift the canvas off for cleaning. The strip around the outside edge of the lid is leather. A new piece is coming from UK, courtesy of the folks that made me the straps used on the shield.
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I am giving consideration to sanding it back, and re-finishing, complete with stencil markings. Fairly sure I have located a suitable font for the stencils. What I don't know is if the vinyl film will stay firmly stuck down long enough for me to give the number of coats of paint to replicate the buildup of paint thickness which the original markings have.
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Can anyone help me with identifying the one damaged character that I can't decipher?
Is it a letter O or numeral 0, or perhaps something else entirely? To me it looks to read: No. - CM-1600 Do you agree?