10-03-2019, 10:23 AM
Welcome to the Phorum!
The model 37-610 chassis is different from a 37-620 (see schematics at Nostalgiaair.com) The 121 and 125 designations are code numbers, essentially version numbers for a given model year. (see Identification Guide in our library)
![Icon_wave Icon_wave](https://philcoradio.com/phorum/images/smilies/icon_wave.gif)
The model 37-610 chassis is different from a 37-620 (see schematics at Nostalgiaair.com) The 121 and 125 designations are code numbers, essentially version numbers for a given model year. (see Identification Guide in our library)