Collectability and value is determined by condition, number made and how many are avaliable now or known to exist. For instance a Nagoya series 12 was made at the end of the war and has rough machinging and wood work but its value is close to $2000 because just a few were made and survived. Pictured below are two series 4 T99's, top rifle was made by Nagoya and bottom one was subcontracted out by Nagoya arsenal to Izawa Arsenal. Both look alike but the Izawa is worth about $1000 and the Nagoya around $500.