I had a "hard to find" combo ....
I had a "hard to find" combo ....
I like the Voigtlander offerings in old folders. I had an early Bessa RF (rangefinder) with a Heliar lens. The rangefinder mechanism was the same as the later Bessa II. But for a while the Bessa RF's were a lot less money than a nice Bessa II. Also, unlike the Bessa II, there was an internal mask (removable) which allowed me to shoot 6X4.5 and get 15 frames from a roll of 120. The cameras that offer this kind of option (not many) have two ruby windows on the back door, with slides to close them.
After I sold the RF, I found a rather rare combo. A Bessa 1, with a Color Skopar lens, a compur shutter (1/500th) and the internal mask (getting the mask with any of these is a real find). That camera was a real find. While it was front cell focusing, it had a slightly sturdier set of front standards than either of the two RF models, which made focusing a bit of a chore, but more reliable.
The Bessa RF had four lens choices. The Bessa 1, typically came with a Vaskar lens, and the Bessa II had 3 or four choices.
Know one thing about all folders in the 40's and 50's. They often came with a consumer or department store lens for the masses, an upgrade lens for the knowledgeable but frugal, and a high quality lens for the monied gentry and professionals. The lenses were triplets, 4 element and 5 element.
The Vaskar and Helomars were triplets, The Color Skopars were 4 element and later examples were coated better, and the Heliars were 5 element. There is one lens that puts a Bessa II in the over $2000 category. It uses Lanthanium (spelling?) in it's makeup.
This is true of many mfr folders. High end Zeiss Ikons used Zeiss glass, while middle of the road used Nettar.
Also, a good 6X9 folder that has been well cared for will take very nice pictures even with the Vaskar and Helomar lenses.
In nice condition:
Bessa RF's are selling for $250 to 500 depending on the lens
Bessa I's sell routinely around $100 with a Vaskar, $200 with a Color Skopar
Bessa II's routinely sell for $300 to over $2000 depending on lens. (I have only seen 3 Bessa II's with the Lanthanium based lens)
The dual format mask on either of the first two will generally add to the price and is difficult to find.
Another option is a copy of a Zeiss Ikon... the russian Moska5. It is a rangefinder, has the dual format option (watch for the plate accompanying the camera), and has been noted to have a nice lens. However, the russian quality issue is present on those cameras.
If I were going to buy a Moskva 5, I would probably only buy one that CERTO6 on eBay (Jurgen Kreckel) was selling. I have had him do repairs and bought from him. He is quite the folder man. Here is a link to his site. (not affiliated):
http://www.certo6.com/
The options are vast in the old folder market. If you know you only want a 6X9 camera, there are many to choose from. If you want the dual format option, which would fill out nicely around your 6X6, the market is somewhat limited.
Good luck. The market is rife with good, average, and poor examples.