There are some very interesting manuscripts within WSU’s archives. See especially
Wallace Cessna Aircraft Company Collection. They have production cards for several different models but, unfortunately, not for the C-170.
Actually, I've found one card for a C-170. It's filed with the C-180 cards. Like George's plane, this one went to Central America. But what's weird is that it is s/n 24000. According to Cessna there is a gap in production serial numbers in 1952. This gap would be serial numbers 21000 through 24999. This plane, s/n 24000, was delivered to El Salvador in 1956.
- Click to Enlarge
The following aircraft, s/n 24001, was a Cessna 325. What the heck is a 325 you ask? According to Thompson,
An agricultural version of the L-19 called the Model 325 was first flown by R.L. "Bob" Crawshaw on January 31, 1955. It featured a tank for dust or spray materials in place of the rear seat, a 230 HP engine, constant-speed propeller, and larger tires and brakes. Only four units were produced for evaluation by a selected agplane operator in Stuttgart, Arkansas. Since the market was judged to be inadequate, the project was dropped in 1956. (Cessna: Wings for the World, pg.179)
- Click to Enlarge
In our Directory there is at least one additional C-170 that falls within the s/n 21000-24999 range: N1896C is s/n 24061 and is listed as a 1952 C-170B.