You can look in a free antibody database at Labome.com. You can check the following link: http://www.labome.com/review/gene/human/cyclin-B1-antibody.html
In particular, Santa Cruz Biotechnology provides mouse monoclonal cyclin B1 antibody GNS1 (sc-245) which was used in Western Blot on mouse samples (reference: Rizkallah et al., Oncotarget 2015 and Jiao et al., PLoS One 2014, dilution 1:500). There is also rabbit polyclonal cyclin B1 antibody H-433 (sc-752), which is suitable for Western Blot on mouse samples (reference: Toko et al., J Biol Chem 2014). In addition, Cell Signaling Technology offers rabbit polyclonal (Cell Signaling, 4138, reference: Anderson et al. FEBS Open Bio 2015) and mouse monoclonal (Cell Signaling Technology, 4135) anti-mouse cyclin B1 antibody for Western Blot. I hope these suggestions are helpful.