Sorry, not been looking at the Forum for while so missed this one.
I’m afraid I do not have any Cooper Peglar Sprayers/Syringes to the best of my knowledge. Although I have quiet a few items with no ID – so I may have some without realising it.
The trouble is that any labelling which is not embossed into the casing itself is likely to wear off through use. Those that still have them have probably had very light use.
I now tend to avoid any syringes that have no ID unless there is something unusual about them. Sprayer literature is a little thin on a ground as well, except copied from fellow collectors, which makes identification difficult.