This style of tuner is widely available in a range of different qualities - but are rarely available if you want ivoroid buttons.
SE770 Open Gear Tuners Nickel Finish (3 button options)
Guitar Tuning Pegs Tuners Machine Heads Gear 6pcs Metal Open Gear for Acoustic
Gold Vintage Grover/Gotoh-style open back guitar tuners machine heads 3L+3R
GOTOH SXN510V Open Back Tuner - Screw in bushing - M5 Ivoriod knob - Nickel
Chrome Electric Bass Guitar Keys Tuners Machine Heads Open Gear Tuning Pegs 4R
Steel Tuning Pegs Machine Heads 2R+2L Open Gear for 21 / 23 / 26 inch ukulele
