Introduced in 1924 and produced until to 1929 (or 1930?), it appears that the Model H was refered to as the Model H 750 throughout its lifespan,
The first model was the 708cc version with 4-valve heads, and this was followed by a 748cc model with 2-valve heads.[1] The 4-valve model suffered from overheating due to inadequate finning, and was difficult to maintain, not least due to Wanderer using their own threads.
Type H 750 (1)
Engine: V twin, 4-stroke
Capacity: 708 cc
Power: 15 hp
Series: 1924–1927
Type H 750 (2)
Engine: V twin, 4-stroke
Capacity: 748 cc
Power: 20bhp at 4,000rpm
Notes
1. According to H&H. Other sources suggest that the 748 was the first with 4 valve heads.