Seiko SLT019P1
cal. 8F56
Factory Spec. 20 SPY
Thermoinsensitive: High Frequency (196 kHz)
User Adjustable: No (pattern cutting may be possible)
I bought this watch for an example of an 8F movement. It is a movement that is no longer made and which has come in for quite a bit of stick for failing to live up to its 20 SPY accuracy claim. I haven't got a manual for the 8F56, but the manual for other 8F movements suggests that adjusting the rate may be possible by pattern cutting. Pattern cutting involves an irreversible snipping of tiny wires. The rate can be changed only by rather limited amounts, and the pattern can be cut only twice. As I am timing this watch, I haven't yet taken out the battery to see whether the pattern wires exist in this movement.
UPDATE - I have sold this watch (and was rather sorry to see it go).
Some data for this watch is missing because it was not subjected to comprehensive tests.
| Parent Company | Seiko Holdings Corporation |
| Brand | Seiko |
| Model Series | unknown |
| Model Name | unknown |
| Model Number | SLT019P1 |
| Case Number | 0030 |
| Serial Number | 930216 |
| Approx. Date of Manufacture | March 1999 (or 2009?) |
| Calibre (mvt maker) | 8F56 |
| Calibre (brand) | 8F56 |
| Factory SPY | 20 |
| TC Appproach | Thermoinsensitive: HF |
| Frequency (XO 1) | 196 kHz |
| Frequency (XO 2) | n/a |
| Rate Adjustment | none |
| Major Inhibition Period | n/a |
| Minor Inhibition Period | unknown |
| Power | Disposable cell |
| Cell Number | BR2412 |
| Case Back | Screw |
| Water Resistance | 10 bar |
| Features | 4-hand, Arabic numerals at 12, 6, 9 |
| 24hr GMT hand | |
| Rotating bezel | |
| Date (perpetual) | |
| Independently adjustable hour hand | |
| Lume | |
| Timing Results | Basic data & Further details |
| Images | Photos - Large File Sizes! |