Great price on the first factory Longhorn B524, and if I'm not mistaken it might have been the actual Root Beer Sparkle Longhorn B524 that was shown at Winter NAMM 2015(?), seen on the lower left, before returning to the Moollon shop and then heading off to its first owner in NYC:
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BONUS FUN TIME: Other than YJ in his cap and me in the green thing, curious if anyone can guess the identity of the remaining four "notable public figures" at the Moollon booth. I'm 100% sure of just three of them, and have a hunch about the fourth
. . .
Back to the Reverb ad...If that's the original bridge (which it appears to be), then it should be as you have noted.
By principle of keeping things consistently vintage-minded among 4 and 5 stringed Moollon basses, YJ selected 19mm to be the spacing for them all, and all Moollon basses should measure up with the pole pieces / saddles if strung up as done in the shop/by your friendly neighborhood repairperson. Be it the 1960s steel alloy spiral saddles or the 1970s single-groove saddles (YJ doesn't prefer the tone of the plated 1970s saddles, but they're available upon request for those that want to go that route), it's the same for all and there are no other bridge options.