Does not the lustre in the device recesses bother you? IMO the slight silvery look is sheen or min lustre across the surfaces and no corrosive changes as on your examples. Also look carefully at the nicks and defects on the surfaces as well as the edge bruises - no silvery metal showing through. I have a 1960 half crown struck in bronze as well as a 10 P struck in such metal that have a “lustrey” surface to them, these are certified. The OP coin struck by slightly rusty dies which may offer another cue.
I know my photos are not good, but this is a quarter I picked out of my daughter's drink holder in her car. It was so encrusted I couldn't tell what coin it was. I soaked two days, brushed, and finally dabbed eZest over the surface with a cotton swab. Interesting look, definitely from environmental exposure.
Not to hijack the thread. Here is one I got in pocket change. White metal does environmentally damage a deep red color. Here is nickel.
I agree to that; for the record: 3.56 gm for the 1982 penny blank; 5.0 gm for the 20p. Other foreign could substitute as well. I still say that the obvious "red" (actually yellow coloured) lustre in the incised bit of the devices is clearly NOT verdigris or environmental but rather copper/bronze. None of the examples proferred have that. My point about the rusted dies is that they may have sat around a bit and used as mint sport. I have a 1981 5p struck over a 1956 sixpence, so they were up to some shenanigans.
Thank you for all the replies...I will get the coin weighed and report back, hopefully with additional pics, but unfortunately that won’t happen until Monday...have a great weekend and stay safe...
Further comment: I agree the shape is off for a 20P and more consistent with a small flans slightly pushed into the multi-angular shape. Also, obverse a bit softly struck. Addendum: Weight of similar vintage 2 pence: 7.12 gm.
I'm on the side of this being a real OMS error. The surface toning and remaining luster (especially in the incuse legend) presents as a typical heavily toned copper coin. The toning is a later stage of this: arash - I recommend you send these photos to a well renowned error dealer in your country for further verification. These are my favorite type of error
I assume you are in agreement then with what I said? This specimen is near round it appears. My OMS coins, and I have quite a few are much more oxidized bronze in appearance. A few have a silvery iridescence and will try to capture a picture or two when I get home after work.
Hello again, The weight is 3.8 grams, could be 3.7 something as it’s rounded up on the scale. It seems to me it’s struck on a penny Bronze blank or a foreign blank. I am leaning towards a penny blank (Bronze, not copper as I had assumed) as the weight is very close to that, but still would send it off for grading ASAP to rest my case. After seeing the photo below, environmental toning is completely out of the picture IMHO. See attached and once again, fire away! Thank you and stay safe!
OK, here goes 1975 10 pence: Note that this 10P was struck on a bronze blank, the second from top picture is closer to how it appears in hand - quite a bit of "silveriness". However no nickel or silver in it. Sorry for the extra picture.
Here is the 1963 Half crown struck on penny blank (I apologise for the photo quality as shot through the NGC perspex): Photos do not capture the light sheen across the surfaces...
Here is one last one - this is a 1964 threepence struck on a CuNi ROUND blank, but into a dodecagonal die and collar & thus somewhat analogous to the OP coin: