The drilled rear brake bridge and drilled lugs around the head tube are similar to a lot of RIH frames.
Went to see Wim van der Kaaij @ RIH. He told me RIH has never drilled lugs or used the (flattened) chain stays my track frame has... He thought it could be a Bergh Sport build from the 70s. Also an Amsterdam frame builder. Updates of the build here: http://www.lfgss.com/thread79453.html
Original post: http://www.lfgss.com/thread44162-39.html#post2589768
Went to see Wim van der Kaaij @ RIH. He told me RIH has never drilled lugs or used the (flattened) chain stays my track frame has... He thought it could be a Bergh Sport build from the 70s. Also an Amsterdam frame builder. Updates of the build here: http://www.lfgss.com/thread79453.html