The Series A and Series B Sammy the Shunter jigsaws can be distinguished based on several factors including their artwork, themes, and packaging. Unfortunately, specific differences are not well documented in the search results, but here are some general guidelines:

1. Artwork and Themes:

   • Series A often features more simplistic artwork compared to Series B. Series B tends to have more complex and detailed images.
   • The themes of the puzzles might differ, with Series A focusing on more traditional scenes, whereas Series B might include varied and more adventurous themes.

2. Packaging:

   • The packaging design, such as the colors used, the logos, or any branding elements, can differ between the two series.
   • Series B jigsaws might have a more modern or updated look compared to Series A.

Here are some images that might help in distinguishing between the two:

• Series A Example:

• Series B Example:

For a visual comparison, you might want to look at more examples from collectors or databases that specialize in vintage toys and jigsaws. You can find more extensive details by referring to specialized websites or communities focused on vintage jigsaw puzzles.