Seiko Avenue SWKX021 Ref. 1F21-0B10 - May 1989, NOS
The black dial of this Avenue model is encircled by minute numerals ranging from 05 to 60. White hands and bold markers denoting five-minute intervals create a highly legible layout within the small, approximately 25.5 mm case. The long minute hand extends to the outer scale, while the shorter hour hand is easily distinguishable near the center. The sporty character of the SWKX021 is largely derived from this black-and-white dial design.
**IMPORTANT NOTE: As this item is shipped from within the European Union, you will not be subject to customs duties within the EU.**
The serial number 950133 on the case back dates this piece to May 1989. In Seiko’s catalog from that era, this model is categorized under the "Avenue Standard Series" a collection positioned for younger users, featuring simple, everyday watches with a distinct, individual character. In the SWKX021, this philosophy is reflected in its small case, clear minute scale, sapphire crystal, and robust construction suitable for daily wear.
Since there is no date window on the dial, the outer scale remains uninterrupted. The slanted "Avenue" branding appears in the upper section, positioned above the small "Seiko" signature, while the lower section features the inscription "WR 10 BAR." A wide, brushed stainless steel bezel reflects light with a soft, diffused quality, and the short, angular lugs accentuate the compact form of the case.
The dial is protected by a sapphire crystal. The watch’s original period-correct technical tag explicitly highlights both the sapphire crystal and its 10-bar water resistance rating. The same tag provides details on the Calibre 1F21 quartz movement, which offers an accuracy of ±15 seconds per month at normal temperatures, a battery life of approximately two years, and a stop-seconds (hacking) feature.
This particular piece is in NOS (New Old Stock) condition and has never been used. It retains its original sales tag bearing the reference number SWKX021 as well as the Japanese-language technical specifications tag. Because the original leather strap had deteriorated and become unusable after many years in storage, the watch is now fitted with a new calfskin leather strap.
Final Thoughts
The SWKX021 clearly exemplifies the understated, everyday-oriented approach of the "Avenue Standard Series" on a compact scale. With its black 0–60 dial, sapphire crystal, 10-bar water resistance, and compact steel case, it perfectly captures Seiko’s 1989 vision for a younger demographic. Its preservation in NOS condition allows us to appreciate this clean, functional design even more vividly today.
The item you are viewing was manufactured in 1989.
PROFESSIONALLY FULLY SERVICED.
The movement has been completely disassembled; every component has been cleaned, lubricated, and precisely adjusted to ensure flawless operation. (It will not require further servicing for three years, provided it is not subjected to adverse conditions.)
Product Condition: Tested; all functions are in full working order.
