Nancy, you and Mowgli will be in my thoughts today too! He's such a cute lil' guy!
There were a couple more comments on your Pfaff over at Needlebar, compliments.
Yes, the "H" on your machine is the model number...there is a Pfaff "K" pictured at Needlebar, with this caption:
"
Pfaff used letters for early models, but switched to numbering (as did other manufacturers) and by 1916 were up to at least 101. The model K was the family sized machine with L the equivalent larger sized model. These became Klasse 11 and 12."
The "K" model shown there has the same decals as your "H".