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It's difficult to say without seeing a picture, but I'd lean towards genuine. I haven't seen any forgeries of British 1/2d later than the 1790s, and for the early 20th century, it's usually the mid-sized silver denominations (1/, 2/, 2/6) for which I encounter forgeries, usually in lead.

I'll defer to gxseries since I'm not too up to date on Chinese coin values.

China, c. 1920s.

The main advantage of having them slabbed is increased buyer confidence, which, yes, may draw in bids from some buyers who are willing to pay a premium for slabbed pieces However, 1. Slabbing world coins is somewhat expensive. 2. There is a considerable price jump from circulated grades to UNC. 3. Both of your pieces appear to be cleaned, and as such are at risk of being "bodybagged" if sent to PCGS. As gxseries hinted at, high circulated grade Kwangtung province 10c and 20c are relatively common and readily available. A quick search on Ebay shows completed NGC and PCGS MS62-63 of this type at about $70-130, and $200ish only at MS-64. Both of your pieces are circulated, and even slabbed, I can't see them selling for more than $50 apiece with shipping. Chinese silver dollars are hot. The 10 cent and 20 cent coins, not so much, partially because silver dollars have a natural "big coin" attraction to them, and also because the mintages and survival rate of the workhorse dime and double dime are vastly higher.

[Moved to main forums where it may get more attention]

Very interesting and unusual pieces - thank you for sharing!

I think that it may be a reference to redeem-ability of the note. I am not familiar with the minor currency situation in Yunnan at the time, unfortunately.

It appears to be a "circulating certificate" for "half open two dimes" (??)

Perhaps Roman? It's pretty toast, though, unfortunately.

Very nice!

While the Chinese minorities set is great, the back of the 1990 2 (litho?) is kind of a trainwreck compared to the original 1980 issue.

Welcome back! Always nice to see a familiar face.

Hello! Would you care to elaborate perhaps? I'm not aware of any Rhodesian coins issued prior to the 20th century.

Did not Hawaii have a dime?

Very nice. Brockages are considerably scarcer than off-centers.

10%+ off center larger size coins are always nice.

Still a great piece!

Welcome!

1. Metal appears to be pewter or other base white metal rather than silver 2. (pic1) Wreath has 20 flowers instead of 25 3. (pic2) Leaves are outlines only, and not solid. With 97% confidence, I'll say that it is a modern copy.

Byantine follis.

Usually I have a rough order of precedence between the few groups I collect that have overlaps, though when the price is cheap, it is tempting to double up on an item.

Welcome!

Neat!