Vintage Snap-on 2pc SBX Series 12-Point SAE Flank Drive S-Shaped Box Wrench Set SBX1416 SBX1012 7/16-1/2"  and 5/16-3/8" USA Made
Professional-grade S-shaped box wrench set featuring Snap-on's patented Flank Drive system that provides up to 20% more turning power and reduces fastener rounding. This vintage set includes two essential SAE sizes. Made in the USA with Snap-on's special alloy steel, precision-forged and heat-treated for optimum strength. The S-shape design provides improved access in tight spaces.

Included in this set (with current list prices):
7/16–1/2"  SBX1416  $63.75
5/16–3/8"  SBX1012  $58.25

Key Specifications
Made in USA
Manufacturer: Snap-on Tools
Series: SBX (S-Shaped Box End)
Drive Type: 12-Point Flank Drive
Finish: Chrome

Sold as is. No warranty from the seller. No Returns.

CONDITION NOTE: Used, and in excellent condition overall. Wrenches have some light surface scratches and dirt from storage & use (see pictures)! Does not include the original box, or packing materials. See detailed high resolution (zoom-able) pictures to know what you are purchasing.

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Source of product research for this listing was from an AI engine and I cannot be sure that it is 100% accurate. I encourage you to confirm this information with your own research.
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Manufacturer Background
Snap-on was founded in 1920 by Joe Johnson and William Seidemann in Milwaukee, Wisconsin. The company revolutionized the tool industry with their interchangeable socket concept and became known for premium quality professional tools. In 1965, they received their important patent for the Flank Drive design, which significantly improved wrench performance5
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Age/Release Date
This set likely dates to the late 1960s or early 1970s, following the 1965 Flank Drive patent.

Search Keywords
snap-on wrench, vintage tools, flank drive, mechanics tools, SAE wrench, professional tools, USA made tools, box end wrench, S-shaped wrench, snap on, tool collector, automotive tools, chrome wrench, snapon, industrial tools

NOTE: If you would like to see all the Mechanics Tools that I currently have listed, please check out this eBay Store category now and to watch for more pieces being added over the coming weeks/months: https://www.ebay.com/str/quantumonlinesalesservices/Mechanics-Tools/_i.html?store_cat=34571823011