That can be collected: a collectible loan.
Worthy of being collected: collectible antique coins.
One of a group or class of objects, such as period glass or historical memorabilia, sought by collectors.
American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.