Leah I.

Mearto specialist

Thank you for contacting Mearto. This is a Bach 42BO trombone. Below I have included links to asking and hammer prices for this model. I could not find a model called 42 K on the Bach site. I did see this on trombones for sale and have listed links below. If I am misunderstanding the model, please let me know. Yours appears to be in very good condition and I have taken this into account in my valuation. Serial number 31042, 1977-78: https://www.bachloyalist.com/serial-numbers-trombone/ Model info 42BO: https://www.bachbrass.com/instruments/trombones/42bo Bach 42K trombone asking prices: $499, ‘poor condition’ https://reverb.com/item/1087095-vincent-bach-42k-stradivarius-bb $1600 https://brassgurus.com/products/used-bach-42k-tenor-trombone-gold-brass-bell $1699 https://reverb.com/item/13447257-used-bach-42k-tenor-trombone-gold-brass-bell New $1989 https://www.guitarcenter.com/Bach/42K-Stradivarius-Professional-Trombone.gc 42BO asking prices: $1874, ‘good’ https://bit.ly/3lcsh7Q $2750, ‘mint’ https://bit.ly/3yj5St4 $2889, mint https://reverb.com/item/18871637-bach-42bo-stradivarius-tenor-trombone-f-rotor-open-wrap $2999, condition unclear https://bit.ly/3zQKwDM $2999, mint https://bit.ly/3lcshVo $3200, good https://reverb.com/item/37125891-bach-42bo-stradivarius-series-f-attachment-trombone-with-lacquer-slide $3399 new https://reverb.com/p/bach-42bo-stradivarius-series-tenor-trombone-w-slash-open-wrap-f-attachment-standard-rotor-valve Hammer prices: $821 42BO https://www.ebay.com/itm/393431792432?hash=item5b9a5cbb30:g:8sYAAOSwQMVg050p $860 42BO https://www.ebay.com/itm/114794446702?hash=item1aba483f6e:g:SrkAAOSwyXRgkc8n $1699 42BO https://www.ebay.com/itm/294121704192?hash=item447b050b00:g:CrIAAOSwVO5gdzdn $2749, ‘mint’ 42BO https://www.ebay.com/itm/333872841025?epid=22009472522&hash=item4dbc5f4141:g:kckAAOSwzdZgFFU1