The "Solar" brand name was a house brand used by the high-quality Canadian retailer Eatons, who partnered with established Swiss watchmakers such as Gallet and Rolex (for their "Aqua Solar" line) to produce watches under their own name.

Movement: This particular watch likely contains a quality Swiss manual-wind movement, such as an FHF 55 caliber, typical of those used in these co-branded models.

Key Features

Jewels: The "21" on the dial refers to the 21 jewels in its mechanical movement, which help reduce friction.

Manual Wind: As a vintage mechanical watch, it is not battery-operated and must be hand-wound regularly to operate.

Condition: The watch in the image shows some signs of wear, including scratches on the crystal and aging on the dial, which is common for a vintage timepiece.