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Collectibles-General (Antiques)/Groetchen 21 vender back door.


21 vender
21 vender  

I am restoring a Groetchen 21 vender I found.
It is working and the mechanism and the gumball vendor are complete.

All I'm missing is the back door and maybe a cashbox???

Do you happen to know where to get a back door and a cashbox (If it had one)

Hope to hear from you

The Netherlands

Hi Rudolf,

Nice machine and a very nice restoration. Back doors on these trade simulators always seem to be missing for some reason. There is one guy that has some parts, reel strips and award cards for trade stimulators, and he has a catalog. If you want to write me at I'll be happy to forward this catalog to you in a pdf file. Other than that, you would just have to keep an eye for one on ebay, under this search:

You can also post an add on our forum for free if you like and see if someone has one or even if someone knows who might have some reproduction doors. The forum is located here:

I hope some of this information leads you to the back door that you need for your machine. Oh…. Most trade stimulators that I have seen don't use cash boxes, the money just ended up in the bottom of them but maybe a disposable meat loaf tin which you can bend and mold easy would work inside there for a cash box, I know I have used this before to have something to catch coins in a machine.

Thank You

Rodger Knutson

Collectibles-General (Antiques)

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Rodger Knutson


I am an expert on old coin operated machines, slot machines, trade stimulator's, jukeboxes, old arcade machines, etc. I have been identifying these for people who respond to my web site listed below, for a few years now. In almost all cases I am able to tell them about their old coin operated machines, the year, the value, and other general information about their machines. I do not know much about soda vending machines, coin banks, or scales, but I will try to help you with these if I can. Please email photo's to: My web site is at:


I bought my first slot machine, a .50 Cent Mills Black Cherry in 1969 and have been hooked from that time, I still have that Slot machine! Before that I found a open barrel full of old scraped jukebox wall boxes behind a restaurant, I wanted them all but never took a one of them. Anything that took a coin drove me nuts!

C.O.C.A. and other slot and coin operated machine groups, associations, groups, and clubs.

Many, the Coinslot magazine, always juken, Coin Slot Journal, Slot Box Collector, and others that I don’t remember at this time.

Graduated from Ballard High School in 1969, went to Edison Technical Collage for a couple of years taking welding and metal fabrication, tig, mig, heliarc, also arc and gas welding and fabrication. Then Apprenticed under a slot machine technician who worked in the slot machine industry Reno Nevada, and set up bar poker progressive machines in the casino's, and repaired machine and did the repairs on slot machine circuit boards there. He also was involved in the 2 hand dealer's market and bought and sold machines at the casinos auctions for the secondary market, which includes selling used machine overseas. I learned a ton from this man; he always had the correct answers and took the time to teach me the business. My interest and knowledge in other and older coin operated machine is for the most part, self-taught. It's been my passion from back in 1968 and before, my thirst for knowledge about these machines has kept me more interested over the years, and keeps me searching for more information even today. I have meet and talked to book authors on these machines, attended hundreds of coin operated shows and auctions, and I stay with that to this very day.

Awards and Honors
Take a look at my allexperts rating, and my guest book, links to these are at Also you can check my 100 percent rating on ebay, as I have been there with ebay from their day one, I am user coinslots at ebay. My other awards come from the very people that I deal with, I always make them happy, no matter what it takes, but they always are happy anyway as the countless thank you letters testify to me, so I know I am doing right, and the best I can. I have found so many hard to find parts for people, I hunt them down and don't stop until I find what is needed to get that customers machine running again and back to life, that is my main goal.

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Client privacy prevents this answer, as some are VIP and famous and I will not betray the trust.

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