Is This Netherland Indies Overprint Fake ?

i just buy a bulk stamps, and I find a not listed stamp in my cataloque, please help me, cause when I try to sell them in ebay, a friend message me that their overprint is false or home make. how to check if they are real or not.. thanks alot
http://www.ebay.com/itm/Indonesia-S...STRK:MESE:IT

TJETJUN1-----Welcome to this chat room , to answer your question the overprint should be in red ink [almost orange in color, that could be from soaking of the stamp ?} with bars thru the 30 and 10 printed below the two bars . The Scott catalog says it was issued Sept 1937 it has a value of $2.50.The 10 on the 32 cent stamp is in black .

this is their picture. thank

thanks for reply sir, some of my friend said, maybe this is proof, but I dont have proof cataloque for netherland indies... I know this is different from my stamp cataloque, and before I bought them, I already asked my friend that just got the vermeil from exhibition for his netherland indies stamps collection, he also bought some and said he didnt find them in cataloque too..

thanks alot and still wait some one can confirmed

In 1937 two values were overprinted as an emergency measure because the post office was running out of 10 cent stamps.
one stamp was the 30 cent grey which was overprinted with one red bar through the 30 and 10 in red below it.
The other value was the 32.5 cent which was a red ( orange ) stamp. It was overprinted with the 10 in grey over the value. Since the 10 looked just like the one in your example above, it could be a proof?

Peter

Here are the two stamps from one of my stockbooks ------as you can see in the picture it is different than what is posted above .

Thank you, Floortrader. And I edited my post above, the red overprint only shows one bar!
There is a third stamp that is similar, issued in 1930. It is a 20 cent blue with three red bars through the 20, and 12.5 cents in red over the Queen's bust.

Peter

Nore NVPH 90, nore NVPH 92 mentions this. And that is curious. Reversed overprint of 10c on 30 is mentioned (it seems there was one sheet of 100 stamps). I've tried a few dutch keywords, but no result on the internet:
1937 Nederlands Indie / hulpuitgifte / opdruk zwart op 30 c grijs / PROEF/ :)
By the way, NVPH #228-229. Were valid till 31.12.1938

Wadmalatz, the third stamp is listed in the NVPH as #171!

Peter

thanks for you posting mr. peter, mr. floortrader and mr. wadmalatz. when I buy, there only left a few pieces, not more than 10, and my friend specialy in ned indies bought two. so only the left I got.. but I still try to check this items, cause my supplier have alot alot old stamps from indonesia from vienna to now... all fullsheet stamps.. and always more than 1 fullsheet, except this
please help if you how to know to check the stamp..
thanks alot