Need assistance with China currency

My great aunt and uncle were missionaries in China back in the 40s and brought back coin and currency, giving them to my grandmother, which passed them to my mother and then to me. I've managed to identify the coins but other than the obvious English printed on the currency, I'm kind of at a loss. I have found some information, like the 5000 yuan gold unit notes came out in 1947, but no real information about their history. I've searched PMG, Banknotes, Coinsite, and others but find very little information.
I have four large size 5000 yuan, six small size, two printed in blue, and a 25,000 yuan printed in green, which I can't find listed anywhere. All say "The Central Bank of China and customs gold units. I know they have been devaluated.
Any help would be appreciated.



Note: the upper middle one doesn't have a date and is slightly larger.





1948 issue. 25000 yuan doesn't have a date.
Thanks in advance for your assistance.

 

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I use this website to help identify World Notes.
http://banknote.ws/

Lots of photos and descriptions.

 

Thanks Steve. I'll check it out.

 

Thanks so much @SteveInTampa. I found all of them in a minute. It helps to have the right resources and the help from members of this forum. Now, would you happen to know of a resource to figure their value, if any?

 

This currency was:
Purpose
issued to facilitate Customs payments; after WWII used also for general circulation

 

I imagine I would start by checking past sales history (archives) at both Heritage and eBay.

 

Thanks. I didn't find these particular notes at either location, but maybe I didn't dive deep enough.

 

So checking Krause, I got this:
For the 1947 5000 CGU, they are worth around $3 each (catalog at VF is $3.50)
For the 1948 one (top middle one), it is worth about $2 (cat: $1.25 in VG)
For the other 1937 ones (three yellow ones), worth about $3 each (cat: $1.25 in VG)
For the 1948 (blue ones), worth about $1.50 each (cat: $1.25 in VG)
For the 25,000 CGU 1948, worth about $4 (cat: $3 in VG)
China’s main currency, the yuan, was undergoing severe inflation at this time, so the Customs Gold Units, which were originally meant to help with customs payments, entered general circulation and underwent inflation themselves over the next few years. Yours are from the later period.
I determined the value through looking at the catalog values for the notes and roughly grading them.
I hope that helps!

 

I own a 1 and 5 CGU printed in 1930, which shows you how long the notes were made prior to yours.

 

@Mountain Man, can't contribute any knowledge, but have to say those are magnificent, even in their circulated condition!

@SteveInTampa, thanks for the website, it's awesome!

 

Thank you. I don't have Krause to look them up, so appreciate your time and effort.

 

Welcome! I like doing it!

 

Here's some great info on the ROC Customs Gold Unit
https://en.wikipedia.org/wiki/Chinese_customs_gold_unit