About	Details	and then some
Manufacture	Seiko	Skyliner
Model reference	SLN62	6220-7140
Movement	Manual
Caliber	6220
Dial	Woodpanels silver
Case	36x39x09mm	Steel
Lugs	18mm
Bracelet	Leather	22cm
Crystal serial #	Unknown	Acrylic
Timegrapher	Amp. 230, Err 1.0	Accuracy:-20/+20spd
Jewels	21
Serial #	77xxxx	Production: 1967-07
Condition	NOS
Service	Not required
Box & Papers	Box	Papers

The Seiko 6200 manual movement was made from 1960 until 1969, it did not start its production life as such however but as the 394/395/400.
The 6200 family was a movement for high-end Seiko watches, based on the 6100 family it ran at 18,000 A/h, rather than 21,600 or 36,000, which is not to its detriment at all as in fact it was the first 62GS Grand Seiko movement available, with automatic winding added.
Calibre 6200 was used in the Grand Seiko 62GS line. Only the Hi-Beat 6100 movement beginning in 1968 could replace it after the 62GS was retired in 1969.

Still, before all that evolution this particular Seiko Skyliner was mid-range back in the 60s, just below the King and the Grand. Like many Seikos of that time it is conservatively styled but already sized up to 36mm, meaning that this 50 year old watch is very wearable today.
There were quite a few variants. some (like this one) finished to a very high degree, easily competing with the early GS, which indicates the success and the value of this robust workhorse movement to Seiko.

• 6200 (1960) - 21/23 jewels, Seiko Liner (LN), hand-winding
  
• 6201B (1960) - 20 jewels, Seikomatic/Matic Silverwave (MA), automatic
  
• 394/6205A
  
• 395/6205B (1962) - 17-24 jewels, Auto Matic Selfdater (MAS), automatic
  
• 6206A,B (1963) - 26 jewels, Seiko Business/Seikomatic Weekdater (62B-MAW), automatic
  
• 6215A (1967) - Seiko Professional Diver 300, automatic
  
• 6216A - 39 jewels, Seikomatic Weekdater (62MWK), 19,800 A/h, automatic, same as 6246
  
• 6217A (1964), 17 jewels, Seiko Matic Divers (62MAS) and Seiko Matic Worldtime (MASWT), automatic
  
• 6218A,B,C (1964), 35 jewels, Seikomatic Weekdater (MAWK), 18,000 A/h, automatic
  
• 400/6219 (1962) - 33 jewels, Auto Matic Weekdater (MAW), automatic
  
• 6220M (1961), 17 jewels, Skyliner (SLN), hand-winding
  
• 6220B,C - 21 jewels, Skyliner (SLN), hand-winding
  
• 6220D - 17-21 jewels, Skyliner (SLN), hand-winding
  
• 6222M - 17 jewels, Skyliner Calendar (SLNC), hand-winding
  
• 6222A,B - 21 jewels, Skyliner Calendar (SLNC), hand-winding
  
• 6222C - 17-21 jewels, Skyliner Calendar (SLNC), hand-winding
  
• 6240 (1963) - 25 jewels, Liner Chronometer, hand-winding
  
• 6245A (1966) - 35 jewels, 62 Grand Seiko/Seikomatic Chronometer (62GAC-H), automatic
  
• 6246A (1966) - 39 jewels, 62 Grand Seiko Weekdater/62Matic Weekdater Chronometer (62GAW-H), automatic