Proto Professional 500 Series Combination Wrench 7pc Set 1222-1210 11/16"-5/16"
This listing is for a Proto Professional 500 Series Combination Wrench 7-piece set, model numbers 1222 through 1210, covering sizes from 11/16 inch down to 5/16 inch. Each wrench features Proto's renowned full polish finish for easy cleaning and corrosion resistance, as well as precise, reliable sizing for professional results. The set is ideal for both mechanics and collectors seeking durable, high-quality American-made tools. All wrenches are made from alloy steel, ensuring strength and longevity. This is a classic set from Proto, a brand trusted by tradespeople for over a century.

Key Specifications
7-piece set: 11/16" to 5/16"
Model numbers: 1222, 1220, 1218, 1216, 1214, 1212, 1210
Material: Alloy Steel
Finish: Full Polish Chrome
Type: Combination Wrenches (open and box end)
Series: 500 Series
Made in USA

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

CONDITION NOTE: Used, and in very good condition overall, but does include the engraved initials "ERV" from the original owner on all of the wrenches (see pictures). 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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Short background on the manufacturer
Proto Tools, now a division of Stanley Black & Decker, was founded in 1907 in Los Angeles as the Plomb Tool Company. Proto is credited with inventing the first combination wrench in 1933 and has built a reputation for producing high-quality, professional-grade hand tools. Over the decades, Proto has been a preferred brand among industrial users, mechanics, and tradespeople for its durability, innovation, and American manufacturing legacy.

Release date or age of item
Proto's 500 Series wrenches have been in production for several decades, with the combination wrench design dating back to the 1930s. The specific 1222–1210 models in this set are most commonly associated with production runs from the 1970s through the early 2000s. Exact dating is difficult due to Proto's lack of a public date code system, but this set likely dates from the late 20th century.

Keywords 
Proto wrench set, Proto 500 series, Proto 1222, Proto 1210, combo wrench set, SAE wrench set, vintage Proto, mechanic tools, made in USA, Proto tools, Stanley Proto, hand tool set, professional wrench, alloy steel wrench, open box wrench

NOTE: If you would like to see all the Mechanics & Hand 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/Tools/_i.html?store_cat=34571407011