Aera Instruments C-1vsBaltic Scalegraph
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Measurements
Catalog photos are all shot at the same flattering size. These aren't: every case below shares one millimeter scale.

C-1

Scalegraph
Diameter
42mm
39.5mm
Lug-to-Lug
49.5mm
47mm
lowest
Thickness
15.8mm
14.1mm
lowest
Water Resistance
100m
100m
Power Reserve
56h
63h
highest
MSRP
$2,950
$1,766
lowest
Movement
Sellita SW510
Sellita SW510
Case
4 specsCrystal & Dial
3 specsMovement
3 specsPricing
1 specsReviews
Synthesized for each watch independently from owner discussions, enthusiast forums, written reviews, and video reviewers.
The Aera Instruments C-1 is praised for its excellent, distinctive design that balances tool-watch masculinity with soft, gentle aesthetics. The 42mm case size is considered large, and a smaller option would be welcome. On balance, reviewers highlight the distinctive design as the primary reason for their positive assessment.
Owners and reviewers widely praise the Baltic Scalegraph for its compelling vintage styling and excellent value at its price point, with its 39.5mm case offering a slim and compact feel. The applied indices are a standout design element, though legibility can occasionally be a challenge due to polished surfaces. The manual-wind Sellita SW510-M movement provides a power reserve of approximately 60-63 hours. One owner reported bezel marker misalignment, which the brand stated was intentional, contradicting expectations. The screw-down pushers and 100m water resistance enhance its sports chronograph feel. Overall, owners and reviewers rate the Baltic Scalegraph highly for its vintage charm combined with modern wearability and capability at the price.
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