Front Headlamp (Headlight) Part 3

次回、この記事の日本語版を投稿します。

In Part 1 of this series Front Headlamp (Headlight) we began looking at vintage Japanese bicycle headlamps, and, examined the various mounting locations and hardware (brackets) in Part 2.  In this post, Part 3, we will look at the three features that, when all are present, typically signify the headlamp is mid-1950s or older.  

1. Lens Size
The diameter of the front glass, also refered to as the lens, is 3" 1/8th to 3" 1/4th inch (79.3mm to 82.5mm) in diameter.

2. Front Cover 
 ①Screw type
    The front cover opens by unscrewing it from the main body.



 ②The lightbulb is housed in a light socket inside the main body.

 ③The rim on the front cover is rounded and there is no lip.

3. Clamp Joint
The clamp joint at the base of the headlamp has two flanges.  



Headlamp manufactures include:  National (later Matsushita), Sanyo, Sankyo, Hatsune, Sun Light, Ogura, and Okada.
It is interesting to note that rear tail lamps were a standard feature. 
(1951 catalog) 

In the next post we shall look at the features that typically signal the headlamp may be mid-to-late 1950s.