Anyone who collects rare motorcycles, either the real-life or toy versions, is likely to have done business with Dave Leitner at one time or another. Over the past half-century, the Michigan native has gotten his kicks riding and dealing in antique bikes while also collecting the smaller-scale toys that emulate them. Alongside the tin and cast-iron toy motorcycles in Leitners vast collection are all sorts of other antique and vintage toys. On Saturday, May 30, Milestone Auctions in suburban Cleveland, Ohio, will bring the first installment of Leitners coveted personal collection to the auction block, offering 750 choice toys from a diverse and enviable assemblage. In addition to in-person bidding at Milestones gallery, several convenient options will be available for remote participation, including absentee, by phone or live via the Internet through any of four popular online-bidding platforms. In considering which toys to include in the debut auction, Leitner says he picked a mixture of all sorts of things that are higher quality and which collectors would recognize as being special. More than 60 motorcycles are in the lineup, with pre-war German and 1950s Japanese productions jockeying for position against American cast-iron bikes. Many have their original boxes. Three antique German-made Lehmann motorcycles are at the forefront of the bike fleet. Each was made in the early 20th century by a celebrated German toy manufacturer who patterned all of his toys after the vehicles, people and animals he encountered in everyday life or during his travels. Many were named after drinking toasts invented by the toymaker and his friends. First amongst the Lehmann motorcycles to be sold is a Halloh Model EPL 725, followed by an Echo Model EPL 683, which is in pristine condition. Each measures 9 inches long and is estimated at $1,000 to $1,500. A very rare Pilot Model EPL 726 is the top-estimated Lehmann toy in the sale. All original with a working windup mechanism, this elusive toy graded VG-excellent is expected to make $6,000 to $8,000. The Leitner collection boasts many sought-after Japanese motorcycles of the post-WWII period, including two boxed 12-inch IY Condors, one with a small headlight and three-gauge dash and the other with a large headlight and two-gauge dash. Each is estimated at $800 to $1,200. Although it is not one of the highest-estimated bikes, one of Leitners favorites is a rare Masudaya (Japan) battery-operated Atom Motorcycle with an unusual action. When the ingeniously-designed toy is activated, the rider appears to dismount to kick-start the bike, then hops back onto it. Its pre-sale estimate is $200 to $400. The robot and space toy selection numbers more than 150 pieces, including some of the most coveted mid-20th-century Japanese productions. One of the top-estimated lots is an all-original Alps Rocket Man robot in pristine condition with its original pictorial box. In working order and complete with both of its original rockets, its auction estimate is $6,000 to $8,000. Another hard-to-find Japanese toy is Masudayas 23-inch tin Space Ship X-7. This silver version of an interplanetary craft shows off a sleek design and appealing colors and has a working friction mechanism. A particularly fine example of a toy that seldom appears in the public marketplace, the X-7 comes to auction at Milestone with a $4,000 to $6,000 estimate. Including the aforementioned Halloh, Echo and Pilot motorcycles, a total of 81 Lehmann toys will cross the auction block. All are different, and 20 have their original boxes. Issued sometime between 1926 and 1935, a lithographed-tin windup Snik & Snak toy, which depicts a man walking two lively dogs on leashes, is an exceptional example with a working windup mechanism. A 9.5-inch UHU amphibious car, all original and complete with driver, is in excellent, clean condition, and has a working windup mechanism. Accompanied by its colorful pictorial box, this toy is of unusual design. Other Lehmanns include a rare boxed Lana tin windup car, an oversize Luxus car, a boxed Veneta trolley car, and many other vehicles and delivery trucks, such as the La La, IHI and Lu Lu. The Dave Leitner Antique & Vintage Toy Collection will be held at Milestones gallery located at 38198 Willoughby Pkwy, Willoughby, Ohio. Start time will be 10 a.m. ET. For additional information, call Miles King at 440-527-8060 or email info@milestoneauctions.com. All images provided by Milestone Auctions.