There isn’t much information online about these boats. The long keel suggests that ballast may be internal. If it is, and if it is steel or iron punchings in a matrix, beware. Any leak or water ingress into the ballast sections of the keel will cause it to rust. Rusting causes the steel or iron to expand. This can blow the keel open and lead to the ballast falling out. If the ballast is lead or if it is externally mounted there is less to worry about.