Here are a few points to add: In 1937 Packard made a model 1507 which had a 139" wheelbase for both Club and Formal Sedans. The model number, 1507, indicates the car has a Twelve cylinder engine, a 139" wheelbase and could be purchased with many different body styles, including a Formal Body or a Club Sedan body. Limiting this discussion to the two body styles in question, the Formal Sedan was designated as body style no. 1032, and the Club Sedan was no. 1036. Both of these model sedans have the same engine and wheelbase. However, be aware both of these sedans were available as either a Twelve or a Super Eight. The pictures shown in this thread appear to be Super Eights which had a 134" wheelbase. Enough of the specs and to make it simple, in 1937 the interior of a Formal has a single jump seat and divider window as Wes points out, and the Club Sedan has neither. The rear seat in a Club Sedan is close coupled, or just forward of the rear axle with the thought that it was therefore "sportier." The Formal Sedan's rear seat is farther to the rear, making the interior passenger compartment "roomier." The exterior of a Club Sedan had a larger built-in trunk, whereas the Formal had a shallower trunk, and a leather top. The rear section of the body is longer in the case of the Formal Sedan as it is not close coupled. There are a few other differances, but these are the main ones. Hope this helps.
