It's doesn't appear to have been used but has been sitting around a while.
eBay
F1 Boring Head Lathe SET MT2 MT3 MT4 C20 C25 BT NT R8 7/16 F1 2 3 Inch 50mm 75mm Milling Head F1 Machine Clamp Boring Bar
Aliexpress UK
Contains one of each 10mm, 12mm & 16mm boring bar.
eBay
Eccentric Type Small Diameter Boring Bar SVUCR/SVQCR HSS Anti-seismic Inner Hole Knife Bar H1208L-SVUCR08-P24 Rod
Aliexpress UK
PRAMET A40T-PCLNR 12 BORING BAR 6757112 Never used Total length 300mm Width 37mm Height 27mm
eBay
Tungsten steel Shockproof SCLCR SCLCL 03 04 Lathe Boring Bar C04H C05H C06K C07K C08K 4-8mm Internal Turning Tool Cutter Bar
Aliexpress UK
New old stock ( unused) Walter 40mm boring bar for WNMG inserts , 300mm long, shim plate and clamp screw included
eBay
8 Sets Of 12MM CNC Lathe Turning Tools Holder Boring Bar With Applicable Inserts And Wrenches Set Cutter For Turning Threading
Aliexpress UK
eBay
BB Carbide Boring Bar MTR MTL Miniature Internal Turing Tool Copying Small Hole Bore Solid Lathe Cutter 0.8-10mm 6mm
Aliexpress UK
Wrench : L3. 1X S20R MCLNR12. Tool cutting edge angle：95 deg. Master insert identification ： CNMG1204. Blade is suitable for processing stainless steel and cast iron parts. Match Plug-in details：. model : CNMG120404-MA.
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1 Set 8/12/16mm Shank Lathe Turning Tool Holder Boring Bar lathe tools lathe cutter Metal Turning Rod Industrial Carbide Inserts
Aliexpress UK
Boring Bar A0508H SWUCR-02
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S06K S07K S08K S10K S12M SCLCR06 10PCS CCMT060204 Internal Turning Holder SCLCR Boring Bar CCMT Carbide Inserts Lathe Tools
Aliexpress UK
Series: HUSHBORE. Type: Anti-Vibration Boring Bar. This tool has been lightly used and shows minor wear, as pictured. Still in great working order. Used – In very good condition. Overall Length: 106mm.
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8Pcs Wood Turning Tools Carbide Tipped Lathe Tools Rougher Turning Chisels Set Boring Bar Holder Set for Wood Processing
Aliexpress UK