Siemens & Halske - Type G42 E12/6 Audio testing equipment

A historic battery rectifier:

Brand: Siemens & Halske.
Type: G42 - E12/6.

This specific type was used at the time to recharge the batteries of early radio receivers or emergency lighting systems via the AC mains.
Equipped with an original Glühkathoden rectifier tube.
With 2 characteristic porcelain fuse holders.

Year of manufacture: 1920-1930.
Weight: 7 kg.
Dimensions: 200 x 410 x 140 mm (W x H x D).
In excellent condition for its age.
From my understanding, the unit is operational, but I have not tested it since I do not have expertise.
The photos are part of the description.