Military token [opgelost]

I have searched the internet with very limited success. I have found similar tokens in different denominations(5¢ and 25¢) for sale on eBay (in much worse conditions) for remarkable amounts(80-200$!). But very little information is available. Best information is that this was a token used by MARINE AIRCRAFT WING OKINAWA JAPAN, but also used during the Vietnam war (in DaNang?) 

Any information?

Both sides identical. 18mm.

Information from the following reference

https://en.numista.com/catalogue/catalogue.php?id=631

Marble Mountain Air Facility (Danang)

Plated Brass

Reference code - VN2930b

No comments on mintage

Comes in 5, 10 and 25 cents

Book values at $5.00

Here's the 25C one on ebay for $10 plus shipping:

https://www.ebay.com/itm/354794290143?hash=item529b633bdf:g:i6wAAOSwDqtivWRD&amdata=enc%3AAQAIAAAA4GaliiD%2FWYn1Y69v2UucQgyMwYTIIfh0iYuOep3zmzRtZh%2Bej8JPsXJCQ2QylZPFLPKO%2BjLCGVd8HJyhvmGZzDJ3GBJNDx4b%2B0%2BkMa1fco9cyQYStpDC9G094u5LkDylpS1lct9OEmxVy241MtejYLXxToMfquKLhkECr3Hb04fnnaClKT08cR2f3wufQNBJl91PIztZmt5OQq9a3yN3gQDV1swKfm19plkzMQqR5hzQPqJ3dTon%2B%2BpwK8ZDbDYhdC4uERtz%2Bt1RT9Q1HIiyojuSjAidUFyA4hgutu2Zr5gq%7Ctkp%3ABk9SR_Ljj9fDYg

thank you.

Steve27

Here's the 25C one on ebay for $10 plus shipping:

 

https://www.ebay.com/itm/354794290143?hash=item529b633bdf:g:i6wAAOSwDqtivWRD&amdata=enc%3AAQAIAAAA4GaliiD%2FWYn1Y69v2UucQgyMwYTIIfh0iYuOep3zmzRtZh%2Bej8JPsXJCQ2QylZPFLPKO%2BjLCGVd8HJyhvmGZzDJ3GBJNDx4b%2B0%2BkMa1fco9cyQYStpDC9G094u5LkDylpS1lct9OEmxVy241MtejYLXxToMfquKLhkECr3Hb04fnnaClKT08cR2f3wufQNBJl91PIztZmt5OQq9a3yN3gQDV1swKfm19plkzMQqR5hzQPqJ3dTon%2B%2BpwK8ZDbDYhdC4uERtz%2Bt1RT9Q1HIiyojuSjAidUFyA4hgutu2Zr5gq%7Ctkp%3ABk9SR_Ljj9fDYg

 

This one is actually part of another set. E is for Enlisted, O is for Officer, S is for Staff. And some of them do or do not have the S in a diamond.