A lot of guesswork, and it's not the best of ships, but it is rather small, so...
Sconosciuto, Italian "Haven't-Got-A-Clue-What-It-Is" ship laid down 1924
Displacement:
177 t light; 182 t standard; 215 t normal; 241 t full load
Loading submergence 36 tons/feet
Dimensions:
124.67 ft x 17.06 ft x 7.87 ft (normal load)
38.00 m x 5.20 m x 2.40 m
Armament:
1 - 2.24" / 57 mm guns
2 - 0.79" / 20 mm AA guns
Weight of broadside 6 lbs / 3 kg
Machinery:
Diesel Internal combustion motors,
Geared drive, 2 shafts, 1,365 shp / 1,019 Kw = 17.50 kts
Range 3,500nm at 12.00 kts
Complement:
28 - 36
Cost:
£0.041 million / $0.162 million
Distribution of weights at normal displacement:
Armament: 1 tons, 0.4 %
Machinery: 45 tons, 20.9 %
Hull, fittings & equipment: 81 tons, 37.7 %
Fuel, ammunition & stores: 38 tons, 17.9 %
Miscellaneous weights: 50 tons, 23.2 %
Metacentric height 0.4
Remarks:
Hull space for machinery, storage & compartmentation is adequate
Room for accommodation & workspaces is cramped
Estimated overall survivability and seakeeping ability:
Relative margin of stability: 1.03
Shellfire needed to sink: 268 lbs / 122 Kg = 47.4 x 2.2 " / 57 mm shells
(Approx weight of penetrating shell hits needed to sink ship excluding critical hits)
Torpedoes needed to sink: 0.3
(Approx number of typical torpedo hits needed to sink ship)
Relative steadiness as gun platform: 40 %
(Average = 50 %)
Relative rocking effect from firing to beam: 0.05
Relative quality as seaboat: 1.08
Hull form characteristics:
Block coefficient: 0.450
Sharpness coefficient: 0.35
Hull speed coefficient 'M': 6.35
'Natural speed' for length: 11.17 kts
Power going to wave formation at top speed: 66 %
Trim: 29
(Maximise stabilty/flotation = 0, Maximise steadiness/seakeeping = 100)
Estimated hull characteristics & strength:
Underwater volume absorbed by magazines and engineering spaces: 96.2 %
Relative accommodation and working space: 69.5 %
(Average = 100%)
Displacement factor: 147 %
(Displacement relative to loading factors)
Relative cross-sectional hull strength: 1.02
(Structure weight / hull surface area: 31 lbs / square foot or 150 Kg / square metre)
Relative longitudinal hull strength: 5.29
(for 8.20 ft / 2.50 m average freeboard, freeboard adjustment 1.17 ft)
Relative composite hull strength: 1.20
What it is used for???
No idea...
Perhaps a submarine chaser?
Walter