Is seems very close to the AM1805 (from ambiq micro) which is more easily available.
yes you’re right Jym , looks like the RV-1805-C3 is an ‘extended’ version of the AM18X5
Small ARM developmentboard
US $4.26 incl. shipping
Need to organise lots of tiny parts ?
I’ve read the black colored ones are for ESD sensitive stuff.
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100 pcs same color ? 
A “piece” is a single small box (they are detachable)
of course … but the price for example US $22.96 for 100 pcs white.
what if you want 6 colors… ? you have to buy 600 ‘pieces’ ? 
Of course you do 
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Be careful, black does not automatically mean ESD safe, that depends on the materials used (and plain ABS does not fit the bill). I can confirm there are black ESD safe ones available for purchase from some vendors as I got them…